On Thu, Mar 28, 2024 at 8:22 AM Gavin Shan [off-list ref] wrote:

All the callers of vhost_get_avail_idx() are concerned to the memory
barrier, imposed by smp_rmb() to ensure the order of the available
ring entry read and avail_idx read.

Improve vhost_get_avail_idx() so that smp_rmb() is executed when
the avail_idx is advanced. With it, the callers needn't to worry
about the memory barrier.

Suggested-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Gavin Shan <redacted>

Acked-by: Jason Wang <jasowang@redhat.com>

Thanks